So when you have a few gallons left in the mixing barrel do you dump it and wipe the insides down and then start over or just start putting RODI in and mix up a new batch?? I notice I have a little slime in my barrel after a bit... I have great flow in it and air stones.. still it gets a little slimy.. I hate wasting the water ... I guess I could bottle it? Does it store well? Using instant ocean reef crystals.